Payments for Irrigation: What Stripe, Square, and the Big Processors Actually Cost You

Irrigation money arrives in seasonal waves: the $199 spring startup, the $350 repair, the $99 blowout, the $4,500 install. Stripe and Square price every one of those at flat rates built for someone else's business — and neither understands a prepaid seasonal package. Below: what each big processor actually costs you at your real ticket sizes, and the seasonal-billing workflows their pages never mention. Pair with AI for irrigation for the surge-answering math.

The fee table, at your ticket sizes

Published 2026 rates, verified October 2026:

• $199 spring startup package, card on file: Stripe 3.4% + $0.30 = $7.07. Square 3.5% + $0.15 = $7.12. Interchange-plus ≈ $4.48.
• $350 repair, online invoice: Stripe 2.9% + $0.30 = $10.45. Square online = $10.45. Interchange-plus ≈ $7.80.
• $99 blowout, card on file: Stripe = $3.67. Square = $3.62. Interchange-plus ≈ $2.28. On 400 blowouts, that's $1,468 vs $912 — $556 for changing nothing but the rate.
• $4,500 install, online: Stripe = $130.80. Interchange-plus ≈ $99.10. ACH 0.8% capped at $5 = $5.00.

The annual math for a mid-size shop: 400 startups at $199 ($79,600) + 300 repairs at $350 ($105,000) + 60 installs at $4,500 ($270,000) = $454,600 a year. At Stripe's blended card rates that's roughly $15,684/year in fees; at interchange-plus about $10,077. The difference — $5,607/year — before you move a single install deposit to ACH, which is where the real money is: a $2,250 install deposit by card costs $65.55; by ACH it costs $5.

The workflow checklist the big processors fail

• Prepaid seasonal packages. The spring startup sold in February as a $199 package — cash in hand before the season starts. The payment layer needs to handle a one-time charge today for a service in April, tied to the schedule. Generic processors can charge it; none of them connect it to your spring book.
• Install deposits. 50% down before you order $2,000 in pipe and heads. Same-day payment link, deposit clears, material gets ordered. A processor that holds large first transactions for review breaks this workflow at the worst moment.
• Card-present on repair day. The reader on the tech's phone: 2.6–2.7% in person beats 2.9% online on a $350 repair by real money, and the customer pays while the system is running in front of them.
• ACH for installs and commercial. Property managers and HOAs pay by ACH anyway. The $4,500 install deposit belongs on ACH ($5) not on a card ($65+).
• Text-to-pay for blowouts. Four hundred $99 blowouts billed by text in October. The per-transaction fixed fee matters here — $0.30 on $99 is 0.30%, but across 400 charges it's $120 of pure fixed-fee drag; interchange-plus's $0.10 fixed fee cuts that to $40.
• Backflow-test compliance billing. Annual backflow tests are compliance-driven and recurring — the rare irrigation revenue that behaves like a route. Card-on-file with automatic annual billing, priced at interchange-plus.

Flat-rate vs interchange-plus, at irrigation volumes

Irrigation is a tale of two rate problems. Problem one is the small ticket: the $99 blowout, where the $0.30 fixed fee is the enemy and interchange-plus's $0.10 fixed fee wins by $0.20 a charge — $80 a season on blowouts alone, and the same math applies to every $199 startup. Problem two is the big ticket: the $4,500 install, where the percentage is the enemy and flat-rate's 2.9% costs $31 more per job than interchange-plus. Flat-rate loses both fights — it just loses them in different places. The seasonal wrinkle: your volume is concentrated in six months, which means a processor with monthly minimums or tiered "volume discounts" that reset annually will quietly overcharge you in the slow months. Price the whole year, not the busy half. And the prepaid package is the cheat code: $199 collected in February by ACH costs $1.59; by card it costs $7.07. Sell the package early, collect it cheap.

The honest verdict, processor by processor

• Stripe: the API handles prepaid packages, payment links, and ACH cleanly — the best technical fit of the big names for a seasonal business. The 3.4% card-on-file rate is still a bad deal for the startup-and-blowout book; negotiate or route around it.
• Square: fine for the tech taking cards at the panel with a reader. Bad for the seasonal book: 3.5% + $0.15 card-on-file is the highest small-ticket rate in the business, and the aggregated-risk model dislikes exactly the April volume spike that defines this trade.
• Adyen: interchange-plus with enterprise implementation costs. Right shape, wrong size for almost every irrigation company.
• Chase Payment Solutions, Fiserv, Global Payments, Worldpay: quote-based, sales-led, no seasonal-package thinking anywhere in their materials. Demand the card-on-file rate, the ACH rate, monthly fees, and contract term in writing.
• Finix (via your own payments setup): interchange-plus across the whole ticket range, tokenized card-on-file for the annual backflow and plan billing, ACH for installs and prepaids. Finix prices the ticket, not the season.

The seasonal billing stack: the Finix playbook

The seasonal billing stack, built right: 1) February — sell the $199 spring startup as a prepaid package, collected by ACH ($1.59) or card; 2) April — startups run against the prepaid book, repairs billed card-present same day; 3) September — blowout text campaign, $99 charges against tokenized cards on file; 4) installs year-round on 50% deposit via payment link, balance on ACH. Finix's public docs (docs.finix.com) cover the primitives — tokenized card-on-file, payment links, ACH — that make this a system instead of a spreadsheet. The same-day repair invoice from a voice note (speak the job, AI builds it, the link texts itself) is ClaroPro's workflow. One caution on prepaids: know your state's rules on advance payments for services — a few states require the funds be held or the contract to include cancellation terms. The paperwork is boring; the February cash flow is not. Rates checked October 2026.

What to watch for

Watch for: monthly minimums that punish your November–February (negotiate them away or pick a processor without them); "free" scheduling software bundled with processing that locks your rate at 3.5% — the software is never free, the rate is the price; next-day funding cutoffs in April when payroll is weekly and the charges are daily; chargeback windows on prepaid packages — a customer who prepays in February and disputes in May is a real pattern, and the signed package terms are your defense; and sales-tax treatment of installs vs. repairs, which differs by state (installed systems are often treated as capital improvements with different rules than repair labor). The parent guide for this trade is irrigation; the software side is tech for irrigation.

Seasonal businesses can't afford year-round processor pricing. Prepaid packages on ACH, installs on interchange-plus, repairs texted same-day. The season is short — keep more of it.